Intraseasonal variability and its impacts to the diurnal cycle over the monsoonal Asia

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This study reveals horizontal distribution of rainfall variability caused by several types of atmospheric disturbances related to the intraseasonal variability over the Indochina Peninsula. During the rainy season, 30-60-day variability originated in the equatorial Indian Ocean causes rainfall fluctuation only to the west of mountain ranges lying in the north-south direction, while westward-propagating vortex disturbances can produce rainfall in both sides of the ranges. This study also investigates causes of a heavy rainfall event in central Vietnam in autumn to discuss how a cold surge propagating from mid-latitudes causes the heavy rainfall.